Clarify Agent home mobility Range

[miquelramirez]

We've introduced into GujaratAgent a homeMobilityRange to distinguish between HunterGatherer homeRange (which should perhaps be called, "huntRange") and the max range to which the agent can move its home. This will probably be different for HunterGatherers and AgroPastoralists.

Right now, when agents are created homeMobilityRange is initialized as follows:

• HunterGatherer::_homeMobilityRange = HunterGatherer::_homeRange
• AgroPastoralist::_homeMobilityRange = AgroPastoralist::_socialRange